<!DOCTYPE html>
<html>
  <head>
    <title>旋轉的小球</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" type="text/css" href="box.css">
  </head>
  <body>
    <div class="box1">666</div>   
    <div class="box2">666</div>
    <div class="box3">666</div>
    <div class="box4">666</div>
  </body>
</html>
